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2 Sheets-Sheet 1. J. S. FREESE. BUTTON HOLE SEWING MACHINE.

Patented July 12,1881.

(No Model.)

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No. 244,222. Patented July 12,1881.

UNITED STATES PATENT OFFICE.

JOHN S. FREESE, OF BROOKLYN, NEW YORK.

BUTTON-HOLE SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 244,222, dated July 12, 1881,

Application filed December 9, 1880. (No model.)

To all whom it may concern:

Be it known that I, J OHN S. FREESE, a citizen of the United States, residing at Bro0klyn, in the county of Kings and State of New York, have invented new and useful Improvements in Button-Hole Sewing-Machines, of which the following is a specification.

This invention relates to the feed mechanism of button hole sewingmachines, and is an improvement on the mechanism described in Letters Patent of the United States No. 183,333, dated October 17, 1876; No. 197,528, dated November 27, 1877, and No. 219,656, dated September 16, 1879.

This mechanism comprises a horizontallyrotating feed-Wheel constructed with a circular groove and a cam-groove, a feed-dog and a brake-dog, both engaging the circular groove, and a lever engaging the cam-groove for automatically adjusting the stroke of the feeddog.

My invention consists in the combination, with the feed-wheel and feed-dog, of an operating-lever constructed with a fixed cam and amovable cam, two elbow-levers connected together by a suitable rod, one engaging the movable cam of the operating-lever and the other engaging the cam-groove of the feedwheel, and a reciprocating rod for transmitting the impulse of the operating-lever to the feed-dog, as hereinafter more fully described.

It also consists in constructing the brakedog with a hook adapted to engage the edge of an opening in the bed-plate of the machine for preventing misplaeement of the braketlog.

This invention is illustrated in the accompanying drawings, in which Figure 1 represents an inverted plan view. Fig. 2 is a crosssection on the line a: m, Fig. 1. Fig. 3 is a section on the line 9 1 Fig. 1. Fig. 4 shows the brake-dog detached. Fig. 5 shows a modification in the connection between the lever and the feed-dog. Fig. 6 is a view of the operating-lever and its concomitants, looking in an opposite direction to Fig. 1. Fig. 7 is an end view of the operating-lever. Fig. 8 is a detail view, showing the manner in which the brakedog is held to its place. Fig. 9 is a perspective view of the brake-dog.

Similar letters indicate corresponding parts.

The letter A designates the bed-plate of the machine; B, the feed-wheel; G, the feed-dog,

and D the brake-dog, both dogs catching in a circular groove, 10, which is formed in the feedwheel B, side by side with a cam-groove, 11, the feed-wheel being sunken into the top of the bed-plate, and the grooves 10 11 being in the lower surface of the wheel, while the dogs pass through and Work in an opening, 12, in the bed-plate. Springs 14 15 are connected to the dogs 0 D, respectively, for retracting the same, and the brake-dog is beveled at one end, where it abuts against a lug or pin, 16, for throwing its other end against the inner side of the circular groove 10, which is the normal position of such dog, the pin 16 constituting a fulcrum for the dog.

The letter F designates the lever for operating the feed-dog O. This operating-lever has its fulcrum on a pivot, 17, and it receives an oscillating motion from a cam-wheel, Gr, revolving on a stud, 18. At the free end of the operating-lever F are arranged two cams, H I, one fixed and the other movable, the fixed cam being integral with the lever 01' being applied thereto in a suitable manner, while the movable cam is guided on the lever by ways 19, the extent of its motion being regulated by a stop-pin, 20, Working in a guide-slot, 21.

The letter J designates the elbow-lever engaging the movable cam I of the operatinglever, and K the elbow-lever engaging the cam-groove 11 of the feed-wheel, these two elbow-levers being connected together by a rod, L, preferably made adjustable. The means whereby the elbow-lever J engages the movable cam I is a segment, 22, bearing against the stop-pin 20, While the means by which the elbow-lever K engages the cam-groove 11 is a stud, 23, passing through and working in a slot, 24, in the bed-plate.

N designates the reciprocating rod, whereby the impulse of the operating-lever F is transmitted to the feed-dog O. This rod N is connected to the feed-dog at one end by a setscrew, 25, passing through a slot, 26, in the feed-dog, while it is exposed to the action of the cam H or I of the operating-lever at its opposite end. The action of the cam H or I on the rod N can be produced through an intermediate lever, O, as shown in Fig. 1, or the cam may act directly on the rod, as shown in Fig. 5, the rod being, in that event, guided, as by a slot, 27, and pin 28. When the stud of the elbow-lever K is in the inner or smaller part of the cam-groove 11, the fixed cam H acts on the reciprocating rod N, and the stroke of the feed-dog U is comparatively short the movable cam I remaining in an inner position while, when the stud of the elbow-lever enters the outer or larger part of the cam-groove, the movable cam is forced out beyond the fixed cam through the elbow-levers J K and their connecting-rod, and the movable cam acts on the reciprocating rod so as to lengthen the stroke of the feed-dog. If it is desired to vary the stroke of the feed-dog 0 this can be accomplished through the medium of the setscrew 25.

The end of the brake-dog D which enters the circular groove 10 is made in the shape of a hook, 29, which catches or engages one edge of the opening 12 in the bed-plate A. By this arrangement the brake-dog D is prevented from falling out of its place in the opening 12 when the machine is brought to a normal position, the dog being entirely detached.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the feed-wheel B and feed-dog O, of an operating-lever constructed with a fixed cam and a movable cam, two elbow-levers connected together by a suitable rod, one engaging the movable cam of the operating-lever and the other engaging the cam-groove of the feed-wheel, and a reciprocating rod for transmitting the impulse of the operating-lever to the feed-dog, the whole adapted to operate substantially as described.

2. The brake dog adapted to catch in a groove in the feed-wheel, and constructed with the hook 29, adapted to engage the opening 12 in the bed-plate for holding it in place, substantially as described.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

JOHN s. FREESE. 11's.

Witnesses:

W. HAUFF, OHAs. WAHLERS. 

